This part is a kind of semiconductor called 74LS47.

Function of this product has BCD to 7-Segment Decoder/Driver with Open-Collector Outputs.

Manufacturers : Fairchild Semiconductor

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Some of the text within the PDF file :

DM74LS47 BCD to 7-Segment Decoder/Driver with Open-Collector Outputs October 1988 Revised March 2000 DM74LS47 BCD to 7-Segment Decoder/Driver with Open-Collector Outputs General Description The DM74LS47 accepts four lines of BCD (8421) input data, generates their complements internally and decodes the data with seven AND/OR gates having open-collector outputs to drive indicator segments directly. Each segment output is guaranteed to sink 24 mA in the ON (LOW) state and withstand 15V in the OFF (HIGH) state with a maximum leakage current of 250 µA. Auxiliary inputs provided blanking, lamp test and cascadable zero-suppression functions. Features s Open-collector outputs s Drive indicator segments directly s Cascadable zero-suppression capability s Lamp test input Ordering Code: Order Nu [ ... ]

74LS47 PDF Datasheet Download